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  Java SE基础篇(二)
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      <h2 id="一、算数运算符"><a href="#一、算数运算符" class="headerlink" title="一、算数运算符"></a>一、算数运算符</h2><h3 id="运算符和表达式"><a href="#运算符和表达式" class="headerlink" title="运算符和表达式"></a>运算符和表达式</h3><ul>
<li><strong>运算符</strong>：对常量或者变量进行操作的符号</li>
<li><strong>表达式</strong>：用运算符把常量或者变量连接起来的符合JAVA语法的句子。</li>
</ul>
<p>算数运算符包括（<strong>+</strong>）（<strong>-</strong>）（*）（/）（%）</p>
<h3 id="字符的-操作"><a href="#字符的-操作" class="headerlink" title="字符的+操作"></a>字符的+操作</h3><p>对字符的与运算是用字符在计算机底层对应的数值来进行计算的</p>
<ul>
<li>ASCLL编码表<br><img src="https://yolin121.oss-cn-beijing.aliyuncs.com/blogimg/Snipaste_2020-07-02_11-30-22.jpg" alt=""></li>
</ul>
<a id="more"></a>

<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">int</span> a=<span class="string">'s'</span>;</span><br><span class="line"><span class="keyword">int</span> b=<span class="string">'a'</span>;</span><br><span class="line">System.out.println((<span class="keyword">int</span>)<span class="string">'s'</span>+<span class="string">" "</span>+(<span class="keyword">int</span>)<span class="string">'a'</span>); <span class="comment">//115 97</span></span><br><span class="line">System.out.println(a+b); <span class="comment">//212</span></span><br></pre></td></tr></table></figure>

<p>前面也提到过，当算术表达式中包含多个基本数据类型的值的时候，整个算术表达式的类型会<strong>自动提升</strong>。</p>
<ul>
<li><strong>等级顺序</strong>：byte,short,char <strong>-&gt;</strong> int <strong>-&gt;</strong> long <strong>-&gt;</strong> float <strong>-&gt;</strong> double</li>
</ul>
<h3 id="字符串的-操作"><a href="#字符串的-操作" class="headerlink" title="字符串的+操作"></a>字符串的+操作</h3><p>当“+”操作中出现字符串时，这个“+”是字符串连接符，而不是算术运算符。</p>
<h2 id="二、赋值运算符"><a href="#二、赋值运算符" class="headerlink" title="二、赋值运算符"></a>二、赋值运算符</h2><table>
<thead>
<tr>
<th>符号</th>
<th>作用</th>
<th>说明</th>
</tr>
</thead>
<tbody><tr>
<td>=</td>
<td>赋值</td>
<td>a=5，将5赋给变量a</td>
</tr>
<tr>
<td>+=</td>
<td>加后赋值</td>
<td>a+=b,将a+b的值赋给a</td>
</tr>
<tr>
<td>-=</td>
<td>减后赋值</td>
<td>a-=b,将a-b的值赋给a</td>
</tr>
<tr>
<td>*=</td>
<td>乘后赋值</td>
<td>a *=b,将a *b的值赋给a</td>
</tr>
<tr>
<td>/=</td>
<td>除后赋值</td>
<td>a/=b,将a /b的值赋给a</td>
</tr>
<tr>
<td>%=</td>
<td>取余后赋值</td>
<td>a%=b,将a%b的余数赋给a</td>
</tr>
</tbody></table>
 <figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"> </span><br><span class="line"><span class="keyword">short</span> s=<span class="number">20</span>;</span><br><span class="line">s+=<span class="number">10</span>;  <span class="comment">//此时不等价于s=s+20;因为扩展的赋值运算符底层包含了强制类型转换</span></span><br><span class="line">s=(<span class="keyword">short</span>)(s+<span class="number">10</span>);</span><br><span class="line">System.out.println(s);  <span class="comment">//40</span></span><br></pre></td></tr></table></figure>

<h2 id="三、自增、自减运算符"><a href="#三、自增、自减运算符" class="headerlink" title="三、自增、自减运算符"></a>三、自增、自减运算符</h2><ul>
<li><p>i++</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">int</span> i=<span class="number">10</span>;</span><br><span class="line">i++;</span><br><span class="line"><span class="keyword">int</span> j=i++;</span><br><span class="line">System.out.println(<span class="string">"i="</span>+i+<span class="string">" j="</span>+j);</span><br><span class="line"><span class="comment">//输出为 i=12 j=11</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>++i</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">int</span> i=<span class="number">10</span>;</span><br><span class="line">++i;</span><br><span class="line"><span class="keyword">int</span> j=++i;</span><br><span class="line">System.out.println(<span class="string">"i="</span>+i+<span class="string">" j="</span>+j);</span><br><span class="line"><span class="comment">//输出为 i=12 j=12</span></span><br></pre></td></tr></table></figure>
<p><strong>可以看出i++是先赋值后运算，++i是先运算后赋值</strong></p>
</li>
</ul>
<h2 id="四、关系运算符"><a href="#四、关系运算符" class="headerlink" title="四、关系运算符"></a>四、关系运算符</h2><p>关系运算符的结果都是<strong>boolean</strong>类型</p>
<table>
<thead>
<tr>
<th>符号</th>
<th>说明</th>
</tr>
</thead>
<tbody><tr>
<td>==</td>
<td>a==b,判断a和b的值是否相等，成立为true，不成立为false</td>
</tr>
<tr>
<td>！=</td>
<td>a！=b,判断a和b的值是否不相等，成立为true，不成立为false</td>
</tr>
<tr>
<td>&gt;</td>
<td>a&gt;b,判断a是否大于b，成立为true，不成立为false</td>
</tr>
<tr>
<td>&gt;=</td>
<td>a&gt;=b,判断a是否大于等于b，成立为true，不成立为false</td>
</tr>
<tr>
<td>&lt;</td>
<td>a&lt;b,判断a是否小于b，成立为true，不成立为false</td>
</tr>
<tr>
<td>&lt;=</td>
<td>a&lt;=b,判断a是否小于等于b，成立为true，不成立为false</td>
</tr>
</tbody></table>
<h2 id="五、逻辑运算符"><a href="#五、逻辑运算符" class="headerlink" title="五、逻辑运算符"></a>五、逻辑运算符</h2><p>逻辑运算符是用来<strong>连接关系表达式</strong>的运算符，也可以直接连接<strong>boolean类型</strong>的常量或变量</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">int</span> a=<span class="number">10</span>,b=<span class="number">20</span>,c=<span class="number">30</span>;</span><br><span class="line"><span class="comment">// &amp; 同true则true</span></span><br><span class="line">System.out.println(b&gt;a&amp;c&gt;b);  <span class="comment">//true</span></span><br><span class="line">System.out.println(a&gt;b&amp;a&lt;c);  <span class="comment">//false</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// | 同false则false</span></span><br><span class="line">System.out.println(b&gt;a||c&gt;b);  <span class="comment">//true</span></span><br><span class="line">System.out.println(a&gt;b||a&gt;c);  <span class="comment">//false</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// ^ 相同为false，不同为true</span></span><br><span class="line">System.out.println(b&gt;a^c&gt;b);  <span class="comment">//false</span></span><br><span class="line">System.out.println(a&gt;b^a&gt;c);  <span class="comment">//false</span></span><br><span class="line">System.out.println(a&lt;b^a&gt;c);  <span class="comment">//false</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// ! 取反</span></span><br><span class="line">System.out.println(!(a&gt;b));  <span class="comment">//true</span></span><br><span class="line">System.out.println(!!(a&gt;b));  <span class="comment">//false</span></span><br></pre></td></tr></table></figure>

<h3 id="短路逻辑运算符"><a href="#短路逻辑运算符" class="headerlink" title="短路逻辑运算符"></a>短路逻辑运算符</h3><h4 id="amp-amp"><a href="#amp-amp" class="headerlink" title="&amp;&amp;"></a>&amp;&amp;</h4><p>作用与&amp;相同，但有短路效果，即如果左边为真，右边执行；<strong>若左边为假，右边不执行</strong></p>
<h4 id=""><a href="#" class="headerlink" title="||"></a>||</h4><p>作用与|相同，有短路效果，即如果左边为假，右边执行；<strong>若左边为真，右边不执行</strong></p>
<h2 id="六、三元运算符"><a href="#六、三元运算符" class="headerlink" title="六、三元运算符"></a>六、三元运算符</h2><p>格式： 关系表达式 ？表达式1 : 表达式2；</p>
<p><strong>a&gt;b?a:b</strong> </p>
<p>(即a&gt;b返回true，则运算结果为a,若为false，运算结果为b)</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">int</span> a=<span class="number">10</span>,b=<span class="number">20</span>;</span><br><span class="line"><span class="keyword">int</span> max= a&gt;b?a:b;</span><br><span class="line">System.out.println(max);  <span class="comment">//输出最大值20</span></span><br></pre></td></tr></table></figure>

<h2 id="七、笔试题"><a href="#七、笔试题" class="headerlink" title="七、笔试题"></a>七、笔试题</h2><blockquote>
<p>写出下面的代码输出结果</p>
</blockquote>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">int</span> x=<span class="number">1</span>,y=<span class="number">1</span>;</span><br><span class="line"><span class="keyword">boolean</span> b;</span><br><span class="line">b=x++&lt;<span class="number">0</span>&amp;&amp;y++&lt;<span class="number">0</span>||x++&lt;<span class="number">0</span>||y++&lt;<span class="number">0</span>&amp;&amp;x++&lt;<span class="number">0</span>&amp;&amp;y++&lt;<span class="number">0</span>;</span><br><span class="line"><span class="comment">// false||x++&lt;0||false x:2,y:2</span></span><br><span class="line"><span class="comment">// x:3,y:2</span></span><br><span class="line">System.out.println(x);</span><br><span class="line">System.out.println(y);</span><br><span class="line">System.out.println(b);</span><br></pre></td></tr></table></figure>

<p><strong>考察内容</strong></p>
<ol>
<li>与运算的优先级比或运算高</li>
<li>短路运算符 不会做多余的运算</li>
</ol>
<p><strong>结果</strong>:</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">3</span><br><span class="line">2</span><br><span class="line">false</span><br></pre></td></tr></table></figure>

<h2 id="思维导图"><a href="#思维导图" class="headerlink" title="思维导图"></a>思维导图</h2><p>ヾ(◍°∇°◍)ﾉﾞ<br>献上</p>
<p><a href="http://www.yolin.xyz/web_test/mind.svg" target="_blank" rel="noopener">Java EE思维导图</a></p>

      
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<!-- Root element of PhotoSwipe. Must have class pswp. -->
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">

    <!-- Background of PhotoSwipe. 
         It's a separate element as animating opacity is faster than rgba(). -->
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    <!-- Slides wrapper with overflow:hidden. -->
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        <!-- Container that holds slides. 
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            Don't modify these 3 pswp__item elements, data is added later on. -->
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            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
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                <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>

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            <div class="pswp__caption">
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                // slider展开状态
                // todo: 这样不好，后面改成状态
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                let items = []
                $imgArr.forEach(($em2, i2) => {
                    let img = $em2.getAttribute('data-idx', i2)
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                    items.push({
                        src: src,
                        w: image.width || $em2.width,
                        h: image.height || $em2.height,
                        title: title
                    })
                })
                var gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, {
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                });
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</script>



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